Either new model for the leaderboard is progressive because it'd encourage people to spar more actively, if nothing else. No leaderboard system is going to prove who "the best" is for more than a short period of time, so I'll support anything that makes people spar more often.
http://www.graalians.com/forums/show...1&postcount=15 helps explain why the points system I outlined is a more favorable solution, because it doesn't rely entirely on who is the most active sparrer or the most skilled. It's a balance between the two.